
    import java.util.Scanner;
    public class training09
    {
        public static void main(String[] args) {



            Scanner sc=new Scanner(System.in);
            System.out.println("请输入班级人数");
            int num = sc.nextInt();
            double[]score = new double[num];
            int gt80 = 0;
            int gt70 = 0;
            int gt60 = 0;
            int lt60 = 0;
            double sum = 0;
            for (int i = 0; i<score.length; i++){
                System.out.println("请输入学号是"+(i+1)+"学生的成绩：");
                score[i]=sc.nextDouble();
                if (score[i]>=80){
                    gt80++;
                }else  if(score[i]>=70){
                    gt70++;
                }else if(score[i]>=60){
                    gt60++;
                }else  if (score[i]>=0){
                    lt60++;
                }else {
                    System.out.println("第"+(i+1)+"成绩格式错误");
                }
            }

            double avg = sum / score.length;
            System.out.println("全班平均成绩为："+avg);
            System.out.println("成绩大于80分："+gt80);
            System.out.println("成绩大于70分："+gt70);
            System.out.println("成绩大于60分："+gt60);
            System.out.println("成绩不合格人数："+lt60);
        }
    }

